Which of the following choices best represents a policy of isolationism? The U. S. entered World War I to protect European countries. The U. S. declared war on Japan after Pearl Harbor was bombed. The U. S. did not interfere when Hitler’s army began to take over Europe. None of these choices are correct.

The U.S. did not interfere when Hitler’s army began to take over Europe.

I mean seriously. The USA is like that one athlete in the corner who is nice to everyone and enjoys reading a book. Hitler was like the top dog who likes to bully everyone. Then suddenly japan. Germany's best friend decided to ruin USA's project. USA did not approve. Then Russia came in to smack out the fascism of Germany. Suddenly the USA took out a nuke. And it's double or nothing. So yeah in short it's the Bolded.

the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.